It depends on the reason for your need to have the conversation. NO one used to believe that it was okay to arbitrarily end a pregnancy simply for convenience sake. There was a time where we as a society would not have considered that any more than beating someone to death.
All those that belief life is sacred from conception to grave aren't intellectual nicompoops. If life isnt sacred in general, and we don't draw lines in the sand, then life isn't valuable at all.
Why does society keep changing the parameters of what is sacred, valuable, right or wrong? What kind of outcome are we looking for from this sliding scale?
That might be a discussion worth having, but trying to make people feel foolish for caring that much isn't.